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Taro is believed to have originated in Southeast Asia and spread west and east thousands of years ago – may have been cultivated very early by people in SE Asia – eventually reached tropical Africa and from there was brought to the West Indies and South America by slaves – today it is cultivated in the tropics where it thrives in wet, saturated soil conditions – propagated by planting corms

The corm is steamed, crushed and made into a dough, then allowed to ferment by microbes – the paste is then eaten with the fingers or rolled into small balls – this is the method for making poi – staple Hawaiian food

Corms can also be prepared like potatoes – steamed, baked, roasted, or boiled

The Green Revolution refers to the transformation of agriculture that began in 1945, largely due to the life work of Norman Borlaug. One significant factor in this revolution was the Mexican government's request to establish an agricultural research station to develop more varieties of wheat that could be used to feed the rapidly growing population of the country.

The main technological development of the Green Revolution was the production of novel wheat cultivars. Agronomists bred cultivars of maize, wheat, and rice that are generally referred to as HYVs or “high-yielding varieties”. HYVs have higher nitrogen-absorbing potential than other varieties. Since cereals that absorbed extra nitrogen would typically lodge, or fall over before harvest, semi-dwarfing genes were bred into their genomes. A Japanese dwarf wheat cultivar (Norin 10) wheat was instrumental in developing Green Revolution wheat cultivars. IR8, the first widely implemented HYV rice to be developed by IRRI, was also a dwarf variety.

Sustainable agriculture integrates three main goals: environmental stewardship, farm profitability, and prosperous farming communities. These goals have been defined by a variety of disciplines and may be looked at from the vantage point of the farmer or the consumer. Sustainable agriculture refers to agricultural production that can be maintained without harming the environment.

Environmentally Sound - Producers actively work to create and sustain cultivated landscapes that are complex, diverse and balanced biological systems. Producers use practices that conserve and restore resources.

Humane Animal Management - While being raised, animals are allowed to engage in the natural behaviors that are important to their well-being, and are harvested in ways that minimize stress to the animals and the environment.

Economically Viable - Producers operate within a framework of sound business planning and pursue integrated and proactive approaches to marketing and sales.

Socially Just - Producers and their employees receive fair and reasonable compensation and work in a safe and respectful environment.

Although air and sunlight are available everywhere on Earth, crops also depend on soil nutrients and the availability of water. When farmers grow and harvest crops, they remove some of these nutrients from the soil.

Possible sources of nitrogen that would, in principle, be available indefinitely, include:

1. recycling crop waste and livestock or treated human manure

2. growing legume crops and forages such as peanuts or alfalfa that form symbioses with nitrogen-fixing bacteria called rhizobia

Other options include long-term crop rotations, returning to natural cycles that annually flood cultivated lands (returning lost nutrients indefinitely) such as the Flooding of the Nile, and use of crop and livestock landraces that are adapted to less than ideal conditions such as pests, drought, or lack of nutrients. Change in marketing of crops – does food have to look perfect?

The Aztecs grew amaranth - Amaranthus hypochondriacus (Family Amaranthaceae). It has many properties that make it a very desirable crop - like potatoes, it is high in lysine, so when used in combination with corn (another Aztec staple) it provides a completely balanced diet - it is a highly efficient C-4 plant, more productive than soybeans, it is very hardy, and is easily cultivated with hand tools - plants grow one to two meters tall and the fruits can be rubbed by hand to break them off the plant and gather them into a basket

Quinoa, Chenopodium quinoa (Family Chenopodiaceae – the goosefoots), was first grown in Peru.

Quinoa has been described as resembling a cross between spinach and sorghum because both the leaves and fruits are edible. It is an annual broad-leaved plant that grows to be 1 to 2 meters tall. The seeds are high in protein, typically 12 to 18%. The protein is also of exceptional quality for a plant source. It is high in the essential amino acids lysine and methionine; lysine is low in most cereal grains and methionine is low in most beans and peas. The seeds are also high in carbohydrate.

The kiwifruit is the edible fruit of a cultivar of the woody vine Actinidia deliciosa and hybrids between this and other species in the genus Actinidia. The fruit was developed in New Zealand. The Actinidia is native to Shaanxi China.

Kiwifruits are a rich source of Vitamin C, A and E. They also contain many flavonoid antioxidants and dietary fiber.

The edible seeds known as pinyon nuts, pine nuts and pinones (Spanish) are a wild commercial nut crop. Eaten raw roasted and in candies they were once a staple food of southwestern Indians. Pinyon ranks first among the native nut trees of the United States that are not also cultivated. Every autumn local residents, especially Navajo Indians and Spanish-Americans, harvest quantities for the local and gourmet markets.

In Europe, pine nuts come from the Stone Pine (Pinus pinea), which has been cultivated for its nuts for over 6,000 years, and harvested from wild trees for far longer. The Swiss Pine (Pinus cembra) is also used to a very small extent.

Pine nuts contain, depending on species, between 10–34% protein, with Stone Pine having the highest content. They are also a source of dietary fiber.

Pine nuts have been eaten in Europe and Asia since the Paleolithic period. They are frequently added to meat, fish and vegetable dishes.

A small minority of pine nuts can cause taste disturbances, developing 1–3 days after consumption and lasting for days or weeks. A bitter, metallic taste is described. Though very unpleasant, there are no lasting effects.